Speaker Device, Sound Source Simulation System, and Echo Cancellation System

• US 20130083937A1
• Filed: 05/31/2011
• Published: 04/04/2013
• Est. Priority Date: 06/02/2010
• Status: Active Grant

• Current Assignee: Yamaha Corporation
• Original Assignee: Yamaha Corporation
• Inventors: Arai, Akira
• Granted Patent: US 8,938,084 B2
• Time in Patent Office: Days
• US Class Current: 381/66
• CPC Class Codes: H04B 3/23 using a replica of transmitted signal in the time domain, e.g. echo cancellers
• CPC Class Codes: H04R 1/028 associated with devices performing functions other than acoustics, e.g. electric candles
• CPC Class Codes: H04R 1/2819 for loudspeaker transducers
• CPC Class Codes: H04R 2499/15 Transducers incorporated in visual displaying devices, e.g. televisions, computer displays, laptops

Abstract

A speaker device includes an enclosure provided with a speaker unit and a bass reflex port, wherein the bass reflex port has an outer opening opened to outside of the enclosure and an inner opening opened to inside of the enclosure, and has a tubular body whose hollow cross-sectional area is gradually reduced along an axial direction of the bass reflex port from its ends to its center, and the tubular body is formed so that a length of the hollow cross-section in one direction does not change along the axial direction, and wherein the inner opening of the bass reflex port is located opposite to the speaker unit, with the bass reflex port sandwiched therebetween.

Claims

1-9. -9. (canceled)

10. A speaker device comprising a phase inversion type enclosure provided with a speaker unit and a bass reflex port,

wherein the bass reflex port has a tubular body whose hollow cross-sectional area is gradually reduced along an axial direction of the bass reflex port from its openings to inside, and the tubular body has a constant size so that a length of the hollow cross-section in one direction does not change along the axial direction,

wherein the opening of the bass reflex port, located at an inner position of the enclosure, is located opposite to the speaker unit, with the bass reflex port sandwiched therebetween, and

wherein a distance between a center position of the speaker unit and a center position of the opening, located at an outer position of the enclosure, is equal to or less than a diameter of the speaker unit.

11. The speaker device according to claim 10,

wherein the bass reflex port is disposed so that the axial direction is orthogonal to a sound wave emission direction of the speaker unit, and

wherein the opening of the bass reflex port, located at the outer position of the enclosure, is opened in the same direction as the sound wave emission direction of the speaker unit.

12. The speaker device according to claim 10,

wherein the opening, located at the outer position of the enclosure, is provided with a protection structure with an opening ratio of 50% or less in a sound wave emission direction.

13. A sound source simulation system comprising:

the speaker device according to claim 10; and

a signal processor configured to supply a sound signal to the speaker device, wherein

the signal processor assigns, to the sound signal, a transfer function of a system leading from a virtual sound source position to a listener.

14. An echo cancellation system comprising:

the speaker device according to claim 10;

a microphone configured to acquire a sound signal; and

an echo canceller configured to generate a pseudo echo component by simulating a transfer function of a system leading from the speaker device to the microphone and by performing a filtering process on a sound signal to be supplied to the speaker device, and configured to remove the generated pseudo echo component from the sound signal acquired by the microphone.